will it add more power

will it add more power if i get a +6 curtis sparks degree key and the +1000 rev box...im a stock 400 ex will it do any thing noticiaple

I dont even think a rev box will do anything for a stock engine, so im guessing the sparks degree key wont do much either, till u get more motor mods, but im not an expert !

No, and no..........the rev box is a complete joke, its like putting a rev box on a tractor, that engine was engineered for torque, not high revs, so build off of that. The offset key would be more apt to help under certain conditions, but only with a specialized engine build.

Actually its quite the oppossite. The key is made for stock to mild engines. Sparks actually says to stay away from modded engines with them. As far as the key goes when I did it I noticed a little bit quicker throttle response from down low. It's nothing major, but is noticable and comes out of a bog better. For the 15-20 bucks it's definately worth it.

Cheeta is correct

i would consider the key. i wouldn't buy their rev box. i made that mistake once. it makes the bike hard to start. also, you won't notice any power gain from it. on a built engine, i would reocmmend a rev box though.